1918.] F. H. Gravely : Passalidae of the World. 71 



Between the outer tubercles is a pair of small and more or less closely approximated 

 (sometimes fused) secondary marginal tubercles, and another such tubercle is situated 

 immediately on the outer side of each. The tubercles situated immediately on the inner 

 side of the fronto-vertical suture are somewhat larger than the two pairs of marginal 

 tubercles last referred to, and are widely separated from them, but they are less pronounced 

 than in Malagassalus clypeatus. Coarse punctures are scattered all along the sides of 

 the pronotum. The metasternum is practically hairless. In all other respects the present 

 species resembles the preceding one. 



Solenocyclus morbillosus (Klug). 



Passcdus morbillosus, Klug, 1832, p. 175. 



Passalus morbillosus, Percheron, 1841, pp. 18-19, pi. lxxvii, fig. 6. 



Eleven specimens from Madagascar, eight being from Fenerive and one (marked 

 ; ' Ciceronius antanarivae, Kuw.") from " Antanarivo " (?= Antananarivo). Also two from 

 Andakana, belonging to M. Guy Babault. Length 20'5-24 - o mm. A smaller but more 

 robust insect than the last. 



The pair of secondary marginal tubercles situated next to the outer side of the true 

 outer tubercles is distinctly larger than the pair situated close to the fronto-vertical suture, 

 and is situated much nearer to the latter than to the former, which are much larger than 

 either. The margin is often notched medially, and the notch may be bounded by 

 an additional pair of minute secondary tubercles. The frontal ridges diverge at right 

 angles from the low central tubercle and extend direct to the inner tubercles where they 

 bend more or less abruptly and extend parallel to one another, or slightly converging, to 

 the outer tubercles. The general surface of the head is smooth and glossy. 



The pronotum is strongly punctured at the sides, and as a rule more or less all over 

 the dorsal surface also. The median groove is strong and complete ; the marginal groove 

 is somewhat widely incomplete in front. The mesosternum is more or less coarsely rugose, 

 especially near the lateral sutures ; the scars are ill-defined or absent. The metasternum 

 and abdominal sterna resemble those of S. approximatus. The grooves of the elytra are 

 almost uniformly punctured. 



Solenocyclus exaratus (Klug). 



Fig. VIII, 2. 



Passalus exaratus, Klug, 1832, p. 173. 



Passalus manouffi, Percheron, 1835, p. 62, pi. iv, fig. 7. 



A number of specimens, mostly from Fenerive. Length 28—32 mm. 



The outer tubercles, and the three pairs of secondary tubercles on the anterior margin 

 of the head, are all of about equal size and about equidistant from each other, except that 

 the secondary tubercles between the outer tubercles are sometimes weaker than the 

 rest. The central tubercle is very large, with a forwardly directed free apex ; the whole 

 surface of the head in front of it is coarsely rugose ; the inner tubercles are minute, and 

 are situated close to the base of the central tubercle, and the frontal ridges are absent in 

 front of them. 



The pronotum is without strong punctures, except in the lateral parts of the marginal 

 groove and in and beside the scars. Both the marginal and the median grooves are 



